Problem is, no matter how advanced you make their culture, no matter how proper their speech, once you have a race that is enslave by another race in any fantasy setting, people will say it's an analogy for black people, because only black people were slaves, and slavery is problematic, and therefore shouldn't be used in any setting because racism. It's stupid braintwisting to try and get wokepoints because that's all the loud Twitter population cares about, and they're the ones who will give you asspats and validate your otherwise unremarkable and pointless existence on the modern interwebs.
There's a quest where it's required to complete it to buy a slave. You buy a Dark Elf slave off a Dark Elf. It's one of the few times the lore being told everywhere up to that point in the series matched the observed reality. In that quest there is a chance if you're observant to take note of an enslaved Breton and an enslaved wood elf, at least I think that was their races.
It's worth noting this is all in Morrowind, a game from 2002, a game so old it's console port was the original Xbox. In recent years I've taken note of that detail. That games interacted with harder topics like slavery, racism, etc in a more matter of fact and realistic way before Twitter and the like cursed our society, and while Morrowind featured and had slavery, it felt organic in how the NPCs interacted with it. The Dark Elves were mostly fine with it when the topic came up, yet the other races from foreign lands were not only against it, but it was illegal everywhere else in the empire, therefore their sensibilities to view it a abhorrent also made sense, in this land the people are doing something the rest of society agreed was a crime.
Yet, no matter what you weren't in a position to shift the legal and political systems in place that allowed slavery to persist in the region to get it outlawed. You were never leading some revolution, it was never a big story plot line. Your interaction was more organic. You could free slaves when you found them, and potentially face the consequences, or you could ignore them like any other NPC. I don't believe the game was advanced enough to treat them any special way for murder or the like it's been awhile. The game only asked you to interact with slavery directly once, and it was the act of acquiring a slave to use to trick some backwards nomads.
It was just a fact of society you had to contemplate on in the back of your head while exploring a mages tower made from a giant mushroom only navigable through the use of magic, or as you sought out the giant bug with a hollowed out shell to use as a taxi.
A unique and wondrous place to explore filled with a different culture, and with a different culture came a different set of morality. It was organic feeling to see nothing crazy about slavery going on. It was barely mentioned, it was just that normal in the culture.
Now days Twitter would try to cancel Bethesda over not making the main quest a slave revolt, while also having racism at all and trying to have a set of analogs to explore some actual historical issues.